Any person performing excavations (see definition below) must first premark the location of the proposed excavation. Premarking entails a person using white spray paint on paved surfaces and other suitable marking materials, such as flags or stakes, on unpaved surfaces to designate the location of the proposed excavation.
The person then calls Dig Safe with the location of the proposed excavation. Dig Safe then notifies the utility operators, which are members of Dig Safe Inc., who operate utilities in the area of said excavation. The utility operators are required to mark their underground facilities within 72 hours (excluding weekends and holidays) of being notified by Dig Safe.
After the person notifies Dig Safe, they can start the excavation after the three-day waiting period. The person making the excavation must take reasonable precautions while digging in the vicinity of the underground utilities.
Excavation includes digging, blasting, hammering posts into the ground, grading, landscaping, and drilling. Demolition of buildings and other structures also requires Dig Safe notification.
Dig Safe Regulations (220 CMR 99.00) 
This information is provided by the Department of Public Utilities